The eventual territorial area of Israel, in our day, will comprise the areas occupied by the 10 nations mentioned in Genesis 15:19-21: ...the Kenites, Kenizzites, Kadmonites, Hittites, Perizzites, Rephaites, Amorites, Canaanites, Girgashites and Jebusites.
Gen 26:1 Now there was a famine in the land--besides the earlier famine of Abraham's time--and Isaac went to Abimelech king of the Philistines in Gerar. 2 The LORD appeared to Isaac and said, "Do not go down to Egypt; live in the land where I tell you to live. 3 Stay in this land for a while, and I will be with you and will bless you. For to you and your descendants I will give all these lands and will confirm the oath I swore to your father Abraham. 4 I will make your descendants as numerous as the stars in the sky and will give them all these lands, and through your offspring all nations on earth will be blessed, ...NIV
The mountains and High places in Israel are extremely important spiritually and strategically. See high-places-israel